Delaying controlled-release acid for acidizing unblocking, preparation method of acid and acidizing unblocking method

A technology for acid release and plugging removal, which is applied in the field of acidizing plugging removal and acidizing plugging removal of oil and water wells. It can solve the problems of poor effect of acidizing plugging removal, etc., and achieve the effect of reducing the cost of measures, low requirements, and improving permeability

Inactive Publication Date: 2016-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a delayed controlled-release acid for acidification and plugging removal, thereby solving the problem of poor acidification and plugging removal effect in low-permeability sandstone reservoirs in the prior art

Method used

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  • Delaying controlled-release acid for acidizing unblocking, preparation method of acid and acidizing unblocking method
  • Delaying controlled-release acid for acidizing unblocking, preparation method of acid and acidizing unblocking method
  • Delaying controlled-release acid for acidizing unblocking, preparation method of acid and acidizing unblocking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The delayed controlled-release acid used for acidification and plugging removal in this embodiment is the pre-fluid, which consists of the following components in percentage by weight: 15% propyl propionate, 8% isoamyl formate, and 8% methyl formate , 0.006% carboxylesterase, 0.2% XT-5 low penetration enhancer, 1.5% ammonium chloride, and the balance is water.

[0024] The preparation method of the above-mentioned delayed controlled-release acid comprises: adding propyl propionate, isopentyl formate, methyl formate, carboxylesterase, drainage aid, ammonium chloride and ammonium bifluoride to the water of 50% formula quantity, stir Mix well; then add the rest of the water, stir well, that is.

Embodiment 2

[0026] The delayed controlled-release acid used for acidification and plugging removal in this embodiment is the pre-fluid, which consists of the following components in percentage by weight: 12% propyl propionate, 4% isoamyl formate, 4% methyl formate , 0.006% carboxylesterase, 0.2% XT-5 low penetration enhancer, 1.5% ammonium chloride, and the balance is water.

[0027] The preparation method of the above-mentioned delayed controlled-release acid comprises: adding propyl propionate, isopentyl formate, methyl formate, carboxylesterase, drainage aid, ammonium chloride and ammonium bifluoride to the water of 40% formula quantity, stir Mix well; then add the rest of the water, stir well, that is.

Embodiment 3～5

[0029] Delayed and controlled-release acid is used for acidification and plugging removal in Examples 3-5, and the delayed and controlled-release acid is used as the pre-flush, and the weight percentage composition is shown in Table 1.

[0030] The formula composition of the delayed controlled-release acid used in the acidification and blocking removal of the embodiment 3-5 of table 1

[0031]

[0032] The preparation method of the delayed controlled-release acid for acidification and blocking removal in Examples 3-5 is the same as in Example 1.

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Abstract

The invention discloses delaying controlled-release acid for acidizing unblocking, a preparation method of the acid and an acidizing unblocking method. The delaying controlled-release acid is prepared from components in percentage by weight as follows: 5%-20% of propyl propanoate, 2%-8% of isoamyl formate, 2%-8% of methyl formate, 0.006% of carboxylesterase, 0.1%-1% of a discharge aiding agent, 0.5%-3% of ammonium chloride, 0-8% of ammonium hydrogen fluoride and the balance of water. According to the delaying controlled-release acid, an acid producing precursor is formed by propyl propanoate, isoamyl formate and methyl formate and catalyzed under the action of carboxylesterase to generate H<+>, and the reaction time is controllable; H<+> is combined with F<-> in ammonium hydrogen fluoride to generate HF acid, the stratum structure can be effectively improved, and the purpose of unblocking and reconstructing the stratum is achieved on the basis that oil well equipment is free of corrosion.

Description

technical field [0001] The invention belongs to the field of acidizing and plugging removal of oil and water wells, and in particular relates to a delayed controlled-release acid for acidizing and plugging removal, a preparation method thereof, and an acidizing and plugging removal method. Background technique [0002] Baolang Oilfield is a low-porosity and ultra-low-permeability sandstone reservoir with low content of rock skeleton and high content of metamorphic rock debris; the heterogeneity of the reservoir is serious, coal beds, interbeds and oil beds exist alternately, and the gap between oil beds and water beds or coal beds The thickness of the interlayer is small; the overall physical properties of the reservoir are poor, and the maturity is low. Baolang Oilfield is currently entering a period of medium-high water-cut development. Due to frequent high-pressure operations and other measures in the early stage, the downhole conditions have deteriorated year by year, oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/74
CPCC09K8/528C09K8/74
Inventor 杨琪汪斌冯兴武李影张燕利郑桐陈雪梅
Owner CHINA PETROLEUM & CHEM CORP
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